At the very core of Marty Rathbun is the intention to destroy. He does this though the use of Alter-is. Rathbun’s followers and allies can be seen displaying this same phenomenon. Mike Rinder for instance cannot say anything in a straight forward way.
Rarely if ever will you hear anything come from Marty without alter is in it. He is a degraded being and is attempting to hurt as many people as he can. Rathbun does this covertly, under the guise of helping others. But Marty continues to alter is the Tech, his memory, and his reports of events.